Ursodiol is a bile acid available as 300 mg capsules suitable for oral administration.

Ursodiol is ursodiol USP (ursodeoxycholic acid), a naturally occurring bile acid found in small quantities in normal human bile and in larger quantities in the biles of certain species of bears. It is a bitter-tasting, white powder freely soluble in ethanol and glacial acetic acid; slightly soluble in chloroform; sparingly soluble in ether; and practically insoluble in water. The chemical name for ursodiol is 3a, 7ß-dihydroxy-5ß-cholan-24-oic acid (C24H40O4). Ursodiol USP has a molecular weight of 392.58. Its structural formula is shown below: